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Screwdriver.

they are fixed sights so you would need a hammer and punch Walther P99 9mm Pistol, 4" Barrel, Fixed Sights, Black, OD Green - 2874172

Hi David and welcome. A small screwdriver will adjust windage. You would replace the front sight with numbered height sights. Review and shooting demo here: https://www.youtube.com/watch?v=j-70Knc486I ----------- Cheers, stay safe and enjoy!

Hi David, the rear sight has a windage screw which can be adjusted with a small screwdriver. Elevation is adjusted by changing the front sight. The front sights are numbered. The higher the number, the higher the front sight. They can be changed using a 1.3mm allen wrench. Stay safe & have a great day!